On the other hand, from my experience:
I wanted to see how Raspberry Pi assembly worked - quite a niche subject (who programs? In assembly? On a Raspberry Pi?).
Yet I found quite a few blogs going through the subject - a tutorial of sorts.
I was also looking up how to write an OS (just for fun) - another fairly niche field. Yet I found tons of tutorials in C, C++, and Rust.
I remember trying the same in the 1990s.
Nada.
You couldn't find nothing. I mean maybe you'll find a basic site with the source-dump of an OS (often without building instructions), but you want to dig into the meat (here is how you get from bootloader to x86-64 in 21 days, and why it works)? Foggetaboutit.
I definitely don't want to go back to pre-google web1.0.